This is a nice place to start if you've just started your research. Academic OneFile is a great resource for locating materials in variety of subjects, including: the physical sciences, technology, medicine, social sciences, arts, humanities and more. Its particular strengths are in peer-reviewed articles on the topics of science and technology.

ARTStor is an ideal source for viewing high quality images of art and architecture throughout history to the present. The images include information on creator, time period, geography, medium and more.